17720420000 has 60 divisors (see below), whose sum is σ = 43594940466. Its totient is φ = 7088160000.

The previous prime is 17720419987. The next prime is 17720420009. The reversal of 17720420000 is 2402771.

It can be written as a sum of positive squares in 5 ways, for example, as 1173199504 + 16547220496 = 34252^2 + 128636^2 .

It is not an unprimeable number, because it can be changed into a prime (17720420009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 423011 + ... + 463010.

Almost surely, 2^17720420000 is an apocalyptic number.

17720420000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

17720420000 is an abundant number, since it is smaller than the sum of its proper divisors (25874520466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17720420000 is an frugal number, since it uses more digits than its factorization.

17720420000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886051 (or 886028 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

Adding to 17720420000 its reverse (2402771), we get a palindrome (17722822771).

The spelling of 17720420000 in words is "seventeen billion, seven hundred twenty million, four hundred twenty thousand".